Throttle Control System - Yamaha EF3000iSE Service Manual

THROTTLE CONTROL SYSTEM

ENGINE DOES NOT START, ENGINE STARTS BUT STALLS, ENGINE SPEED
DOES NOT INCREASE, OR ENGINE SPEED IS UNEVEN.
Check AC output.
GOOD NO GOOD
Rotate the shaft of the throttle control
motor to check if it turns smoothly with
slight resistance.
GOOD NO GOOD
Measure the coil resistance between 3-1,
3-2, 3-4, and 3-5 of the throttle control
motor. (Tester range: Ω × 100)
250 Ω ± 7% /25 °C (77 °F)
5 4 3 2 1
1
5
3
OUT OF SPECIFI-
GOOD
CATION
Check the connections of the wire har-
ness connectors and couplers, and the
wires for an open circuit or short circuit.
GOOD NO GOOD
Defective control unit.
Replace the control unit.
TROUBLESHOOTING
2 4
SVU3850J
3-56
ENG
Refer to "GENERATOR SYSTEM" in CHAPTER 4.
Replace the throttle control motor.
Replace the throttle control motor.
Correct or replace.